CN209559340U - A kind of temperature protection and alarm circuit - Google Patents
A kind of temperature protection and alarm circuit Download PDFInfo
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- CN209559340U CN209559340U CN201920282796.2U CN201920282796U CN209559340U CN 209559340 U CN209559340 U CN 209559340U CN 201920282796 U CN201920282796 U CN 201920282796U CN 209559340 U CN209559340 U CN 209559340U
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Abstract
The utility model provides a kind of temperature protection and alarm circuit, including pressure stabilizing source module, comparison module, temperature sampling module, hysteresis module, signal control module；Pressure stabilizing source module provides high-precision burning voltage for stablizing input voltage for comparison module, temperature collecting module and signal control module；Collected temperature signal is converted to voltage signal and is compared processing with the reference voltage of comparison module by temperature collecting module; a high level or low level voltage are exported to hysteresis module and signal control module; control hysteresis module and signal control module being opened and turn off, so that the shutdown completed to circuit is protected and restored.
Description
Technical field
The utility model relates to device temperature detection fields, specifically, being related to a kind of over-temperature protection and alarm signal
Output circuit.
Background technique
With the development of semiconductor technology and encapsulation technology, the power density of Switching Power Supply is increasing, and transfer efficiency is got over
Come higher, power consumption also increases with it, and internal temperature in the product course of work is caused quickly to increase, cause the damage of electronic device from
And lead to product failure.For the stability and security reliability for guaranteeing the product course of work, need to design excess temperature to Switching Power Supply
Circuit is protected, prevents excessive temperature from safety accident is damaged or caused to product, guarantees the normal work of circuit.Corresponding to existing
There is technology, it can be achieved that modularization, subminaturization are applied in various circuit protections and circuit detection.The utility model is relative to existing
There is temperature protection detection technique, is extended without dedicated temperature protection IC and comparator IC without specific supply district
The range used, reduces costs, and can also realize the electrical isolation between circuit.
Utility model content
In view of the above-mentioned problems, the utility model provides a kind of temperature protection and alarm circuit, it is not necessarily to privacy protection IC
With the power supply of more level, it can be achieved that single level of wide scope is powered, while realizing that detection circuit is isolated with what signal controlled.
The purpose of this utility model is achieved through the following technical solutions:
A kind of temperature protection and alarm circuit, including pressure stabilizing source module, comparison module, temperature use module, hysteresis
Module, signal control module；The pressure stabilizing source module is for stablizing input voltage and exporting high-precision burning voltage, the temperature
Degree acquisition module is used to be converted to temperature signal voltage signal, and the comparison module is for comparing internal reference voltage and temperature
The voltage signal of acquisition module output simultaneously exports a high level or low level, for controlling hysteresis module and signal control module
Open and turn off, to complete to protect the shutdown of circuit and restore；
The input terminal of the pressure stabilizing source module is connected as the input terminal of the temperature protection and alarm circuit and is inputted
Voltage VIN, the input of the input terminal, the temperature sampling module of the output end and comparison module of the pressure stabilizing source module
The input terminal connection at end, the signal control module；The output end of the comparison module and the input terminal of the hysteresis module, institute
State the control terminal connection of signal control module；The output end of the hysteresis module input terminal, institute compared with the comparison module
State the output end connection of temperature sampling module；The feedback output end of the signal control module is as the temperature protection and alarm
The output end of signal circuit.
Preferably, the pressure stabilizing source module includes three terminal regulator U1, resistance R1, resistance R2, resistance R3, capacitor C1；Institute
The input terminal for stating pressure stabilizing source module is connect with the one end resistance R1；The cathode and resistance R2 of the resistance R1 other end and three terminal regulator U1
One end, the one end capacitor C1 are connected to the output end of the pressure stabilizing source module, the ginseng of the resistance R2 other end and three terminal regulator U1
End, the connection of the one end resistance R3 are examined, anode, the resistance R3 other end of three terminal regulator U1 is connect with reference to ground with the capacitor C1 other end.
Preferably, stating comparison module includes three terminal regulator U2 and resistance R4；The one end resistance R4 is as the comparison module
Input terminal, the resistance R4 other end connect three terminal regulator U2 cathode, output end of the tie point as the comparison module,
The anode of comparison input terminal of the reference end of three terminal regulator U2 as the comparison module, three terminal regulator U2 connects reference
Ground.
Preferably, the temperature sampling module includes thermistor RNTC and resistance R5；Thermistor RNTC one end conduct
The input terminal of the temperature sampling module, the thermistor RNTC other end connect the one end resistance R5 as the temperature sampling module
Output end, the resistance R5 other end connection with reference to ground.
Preferably, the thermistor RNTC is negative tempperature coefficient thermistor.
Preferably, the hysteresis module includes switch transistor T 1, resistance R6 and resistance R7；The one end resistance R6 and 1 grid of switch transistor T
Pole is connected to the input terminal of hysteresis module, and the one end resistance R7 connection switch pipe T1 drain electrode, the resistance R7 other end is as hysteresis mould
The output end of block, the resistance R6 other end are connect with reference to ground with 1 source electrode of switch transistor T.
Preferably, the signal control module includes switch transistor T 2 and resistance R8, and the one end resistance R8 is as the signal control
The input terminal of molding block, control terminal of 2 grid of switch transistor T as the signal control module, resistance R8 other end connection switch
Pipe T2 drain electrode while the feedback output end as the signal control module, the connection of 2 source electrode of switch transistor T is with reference to ground.
Preferably, the pressure stabilizing source module further includes zener diode ZD1；Zener diode ZD1 cathode connects resistance R1
One end, the connection of zener diode ZD1 anode is with reference to ground.
Preferably, the signal control module includes resistance R8, switch transistor T 2 and photoelectrical coupler OC1；The one end resistance R8
As the input terminal of the signal control module, control terminal of 2 grid of switch transistor T as the signal control module, resistance R8
The other end connects photoelectrical coupler OC1 light-emitting diodes tube anode, photoelectrical coupler OC1 light-emitting diodes tube cathode connection switch pipe T2
Drain electrode, feedback output end of the photoelectrical coupler OC1 transistor collector as the signal control module, photoelectrical coupler OC1
Transistor emitter connection ground, the connection of 2 source electrode of switch transistor T is with reference to ground.
The beneficial effects of the utility model are as follows:
1, reduce the high demand to chip defencive function；
2, the input voltage of wide scope is adapted to；
3, there is higher electrical isolation safety；
4, it can apply to the temperature protection of various use environments；
5, it is able to satisfy the protection for setting various temperature spots.
Detailed description of the invention
Fig. 1 is the principles of the present invention block diagram；
Fig. 2 is the circuit diagram of the utility model first embodiment；
Fig. 3 is the circuit diagram of the utility model second embodiment；
Fig. 4 is the circuit diagram of the utility model 3rd embodiment.
Specific embodiment
Fig. 1 is the functional block diagram of the utility model temperature protection and alarm circuit, a kind of temperature protection and alarm letter
Number circuit, including pressure stabilizing source module, comparison module, temperature sampling module, hysteresis module and signal control module；The source of stable pressure
The input terminal of module connects input voltage VIN, the source of stable pressure as the input terminal of the temperature protection and alarm circuit
The output end of module and the input terminal of the comparison module, the input terminal of the temperature sampling module, the signal control module
Input terminal connection, the control of the input terminal, the signal control module of the output end of the comparison module and the hysteresis module
End processed connection, the output end of the hysteresis module compared with the comparison module input terminal, the temperature sampling module it is defeated
Outlet connection, the feedback output end of the signal control module is as the temperature protection and the output end of alarm circuit.
In order to be better understood by the utility model, below with reference to specific embodiments and the drawings, to the utility model into one
Step is described in detail.
First embodiment
As shown in Fig. 2, being the circuit diagram of the utility model first embodiment.
Pressure stabilizing source module: including three terminal regulator U1, resistance R1, resistance R2, resistance R3 and capacitor C1；
Comparison module: including three terminal regulator U2 and resistance R4；
Temperature sampling module: including negative tempperature coefficient thermistor RNTC and resistance R5；
Hysteresis module: including switch transistor T 1, resistance R6 and resistance R7；
Signal control module: including switch transistor T 2 and resistance R8.
The connection relationship of each module are as follows:
The one end resistance R1 connects input voltage VIN as the input terminal of pressure stabilizing source module, and the resistance R1 other end and three ends are steady
The cathode of depressor U1 and the one end resistance R2, the one end capacitor C1 are connected to the output end of the pressure stabilizing source module, three terminal regulator
The reference end connection resistance R2 other end of U1 and the one end resistance R3, export a stable voltage value, the sun of three terminal regulator U1
Pole, the resistance R3 other end and the capacitor C1 other end are connected with reference to ground GND；Input of the one end resistance R4 as the comparison module
End, the cathode of resistance R4 other end connection three terminal regulator U2, output end of the tie point as the comparison module, three ends are steady
Comparison input terminal of the reference end of depressor U2 as the comparison module, the anode connection of three terminal regulator U2 is with reference to ground GND；It is negative
Input terminal of the one end temperature coefficient thermistor RNTC as the temperature sampling module, negative tempperature coefficient thermistor RNTC are another
One end connects the one end resistance R5, and tie point is connected to the ratio of the comparison module as the output end of the temperature sampling module
Compared with input terminal, the connection of the resistance R5 other end is with reference to ground GND；The grid of switch transistor T 1 and the one end resistance R6 are connected to the hysteresis
The input terminal of module, the drain electrode of switch transistor T 1 are connected to the comparison input terminal of the comparison module, switch transistor T 1 by resistance R7
Source electrode connected with the resistance R6 other end with reference to ground GND；Input terminal of the one end resistance R8 as the signal control module, switch
The grid of pipe T2 connects the output end of the comparison module, and the drain electrode of the resistance R8 other end and switch transistor T 2 is connected to the letter
The feedback output end of number control module, the source electrode connection of switch transistor T 2 is with reference to ground GND.
The working principle of the present embodiment:
The working principle of the utility model first embodiment are as follows:
When powering on: input voltage VIN is powered by resistance R1 to three terminal regulator U1, the then reference of three terminal regulator U1
One burning voltage U1 of end output, is filtered by capacitor C1, this burning voltage is filtered into cleaner DC voltage, this
The size of burning voltage U1 can be adjusted by the resistance value of resistance R2 and resistance R3；This burning voltage U1 is compared by resistance R4
The three terminal regulator U2 of module powers, and a reference voltage U2 is generated inside three terminal regulator U2；This burning voltage U1 is to subzero temperature
Spend coefficient resistance RNTC and resistance R5 power supply, the electricity that negative tempperature coefficient thermistor RNTC and resistance R5 are generated by partial pressure
Pressure be temperature sampling module output voltage U3, output voltage U3 and three terminal regulator U2 inside generation reference voltage U2 into
Row compares, and as U2>U3, comparison module exports a high voltage UH, and as U2<U3, comparison module exports a low-voltage UL；
The output voltage of comparison module output end is given to the input terminal of hysteresis module, and as comparison module output HIGH voltage UH, control is opened
Pipe T1 conducting is closed, when comparison module exports low-voltage UL, control switch pipe T1 shutdown；This burning voltage U1 is given by resistance R8
Switch transistor T 2 is powered, and the output voltage of comparison module output end is given to the control terminal of signal control module, when comparison module exports
When high voltage UH, control switch pipe T2 conducting, when comparison module exports low-voltage UL, control switch pipe T2 shutdown.
When non-overheat protector: when detected element temperature is not up to overheat protector point, negative tempperature coefficient thermistor RNTC
Resistance value is larger, and the reference voltage U2 generated inside three terminal regulator U2 is greater than the output voltage U3 of temperature sampling module, compares mould
Output end output HIGH voltage UH, driving switch pipe the T1 conducting of block, resistance R5 is in parallel with resistance R7 at this time, the equivalent resistance after parallel connection
Value reduces, and becomes smaller with negative tempperature coefficient thermistor RNTC by the output voltage U3 that partial pressure generates, the output of comparison module
End continues to output high voltage UH, and the feedback output end output of driving switch pipe T2 conducting, the signal control module controls signal,
Secondary circuit will work normally.
When overheat protector: when detected element temperature rises, negative tempperature coefficient thermistor RNTC resistance value becomes smaller, resistance R5
The both end voltage of the equivalent resistance in parallel with resistance R7 increases, with negative tempperature coefficient thermistor RNTC by the defeated of partial pressure generation
Voltage U3 increases out, and when temperature reaches overheat protector point, the output voltage U3 of temperature sampling module is greater than three terminal regulator U2
The reference voltage U2 that inside generates, the output end of comparison module export low-voltage UL, and switch transistor T 1 turns off, and resistance R7 is disconnected, this
When only have resistance R5 to be divided with negative tempperature coefficient thermistor RNTC, the voltage value of output voltage U3 is higher, comparison module
Output end continue to output low-voltage UL, switch transistor T 2 turns off, and the feedback output end of the signal control module is without control signal
Output, secondary circuit can not work normally.
When overheat protector restores: when detected element temperature declines from overheat protector point, negative tempperature coefficient thermistor
RNTC resistance value starts to become larger, and the voltage at the both ends resistance R5 reduces, i.e., the output voltage U3 of temperature sampling module reduces, when temperature is held
When continuing reduction and being lower than overheat protector recovery point, the output voltage U3 of temperature sampling module is less than generation inside three terminal regulator U2
Reference voltage U2, the output end output HIGH voltage UH of comparison module, switch transistor T 1 be connected, resistance R5 is in parallel with resistance R7, and
Equivalent resistance after connection reduces, and becomes smaller with negative tempperature coefficient thermistor RNTC by the output voltage U3 that partial pressure generates, than
Output end compared with module continues to output high voltage UH, driving switch pipe T2 conducting, the feedback output end of the signal control module
Again output control signal, secondary circuit enter normal operating conditions.
Second embodiment
As shown in figure 3, be the circuit diagram of the utility model second embodiment, different from the first embodiment, institute
Stating pressure stabilizing source module further includes a zener diode ZD1；Zener diode ZD1 cathode connects the one end resistance R1, two pole of pressure stabilizing
The connection of pipe ZD1 anode is with reference to ground GND.
The increased zener diode ZD1 of second embodiment is used for clamper input voltage, and protection pressure stabilizing source module bears higher
Input voltage, second embodiment is relatively reliable compared with first embodiment structure, be applicable in input voltage range it is more extensive.
The working principle of the present embodiment is identical with the first embodiment, and does not do tired state herein.
3rd embodiment
As shown in figure 4, be the circuit diagram of the utility model 3rd embodiment, different from the first embodiment, institute
Stating signal control module further includes a photoelectrical coupler OC1；
Input terminal of the one end resistance R8 as the signal control module, 2 grid of switch transistor T control mould as the signal
The control terminal of block, the resistance R8 other end connect photoelectrical coupler OC1 light-emitting diodes tube anode, photoelectrical coupler OC1 light-emitting diodes
Tube cathode connection switch pipe T2 drain electrode, photoelectrical coupler OC1 transistor collector are defeated as the feedback of the signal control module
Outlet, photoelectrical coupler OC1 transistor emitter connection ground.
The signal control module of signal control module compared to the first embodiment, 3rd embodiment increases photoelectric coupling
Device OC1, when overheat protector, the switch transistor T 2 of signal control module is turned off, photoelectrical coupler OC1 transistor collector and transmitting
Pole disconnects, and control signal can not be exported normally；When overheat protector restores, the switch transistor T 2 of signal control module is connected, photoelectricity
Coupler OC1 transistor collector and emitter are shorted, and control signal normally exports, and secondary circuit works normally；Third is implemented
Example increases photoelectrical coupler compared with first embodiment, alarm signal effectively can be transferred to signal detection end, be able to achieve detection circuit
Electrical isolation between signal circuit makes circuit more reliable.
Other working principles of the present embodiment are identical with the first embodiment, and do not do tired state herein.
The above is only the utility model preferred embodiments, it is noted that above-mentioned preferred embodiment should not regard
For the limitation of the utility model, for those skilled in the art, in the spirit for not departing from the utility model
In range, on the basis of the utility model Fig. 1 functional block diagram, some modifications and changes done to the utility model are also answered
When falling into the protection scope of the claims of the present utility model.In addition, although having used some specific arts in this specification
Language, these terms are merely for convenience of description, does not constitute any restrictions to the utility model.
Claims (9)
1. a kind of temperature protection and alarm circuit, it is characterised in that: used including pressure stabilizing source module, comparison module, temperature
Module, hysteresis module, signal control module；The pressure stabilizing source module is for stablizing input voltage and exporting high-precision stable electricity
Pressure, the temperature collecting module are used to be converted to temperature signal voltage signal, and the comparison module is for comparing internal reference
Voltage and the voltage signal of temperature collecting module output simultaneously export a high level or low level, for controlling hysteresis module and letter
Number control module being opened and turning off, so that the shutdown completed to circuit is protected and restored；
The input terminal of the pressure stabilizing source module connects input voltage as the input terminal of the temperature protection and alarm circuit
VIN, the output end of the pressure stabilizing source module and the input terminal of the comparison module, the input terminal of the temperature sampling module, institute
State the input terminal connection of signal control module；Input terminal, the letter of the output end of the comparison module and the hysteresis module
The control terminal connection of number control module；The output end of the hysteresis module input terminal, the temperature compared with the comparison module
Spend the output end connection of sampling module；The feedback output end of the signal control module is as the temperature protection and alarm signal
The output end of circuit.
2. temperature protection according to claim 1 and alarm circuit, it is characterised in that: the pressure stabilizing source module includes
Three terminal regulator U1, resistance R1, resistance R2, resistance R3, capacitor C1；The input terminal of the pressure stabilizing source module and the one end resistance R1 connect
It connects；The cathode and the one end resistance R2, the one end capacitor C1 of the resistance R1 other end and three terminal regulator U1 are connected to the source of stable pressure
The output end of module, the resistance R2 other end are connect with the reference end of three terminal regulator U1, the one end resistance R3, three terminal regulator U1's
Anode, the resistance R3 other end are connect with reference to ground with the capacitor C1 other end.
3. temperature protection according to claim 1 and alarm circuit, it is characterised in that: the comparison module includes three
Hold voltage-stablizer U2 and resistance R4；Input terminal of the one end resistance R4 as the comparison module, it is steady that the resistance R4 other end connects three ends
The cathode of depressor U2, output end of the tie point as the comparison module, the reference end of three terminal regulator U2 is as the ratio
Compared with the comparison input terminal of module, the anode connection of three terminal regulator U2 is with reference to ground.
4. temperature protection according to claim 1 and alarm circuit, it is characterised in that: the temperature sampling module packet
Include thermistor RNTC and resistance R5；Input terminal of the one end thermistor RNTC as the temperature sampling module, thermistor
The RNTC other end connects output end of the one end resistance R5 as the temperature sampling module, and the connection of the resistance R5 other end is with reference to ground.
5. temperature protection according to claim 4 and alarm circuit, it is characterised in that: the thermistor RNTC is
Negative tempperature coefficient thermistor.
6. temperature protection according to claim 1 and alarm circuit, it is characterised in that: the hysteresis module includes opening
Close pipe T1, resistance R6 and resistance R7；The one end resistance R6 and 1 grid of switch transistor T are connected to the input terminal of hysteresis module, resistance R7
One end connection switch pipe T1 drain electrode, output end of the resistance R7 other end as hysteresis module, the resistance R6 other end and switch transistor T 1
Source electrode connection is with reference to ground.
7. temperature protection according to claim 1 and alarm circuit, it is characterised in that: the signal control module packet
Switch transistor T 2 and resistance R8 are included, input terminal of the one end resistance R8 as the signal control module, 2 grid of switch transistor T is as institute
The control terminal of signal control module is stated, resistance R8 other end connection switch pipe T2 drains while as the signal control module
Feedback output end, the connection of 2 source electrode of switch transistor T is with reference to ground.
8. temperature protection according to claim 2 and alarm circuit, it is characterised in that: the pressure stabilizing source module also wraps
Include zener diode ZD1；Zener diode ZD1 cathode connects the one end resistance R1, and the connection of zener diode ZD1 anode is with reference to ground.
9. temperature protection according to claim 7 and alarm circuit, it is characterised in that: the signal control module packet
Include resistance R8, switch transistor T 2 and photoelectrical coupler OC1；Input terminal of the one end resistance R8 as the signal control module, switch
Control terminal of the pipe T2 grid as the signal control module, the resistance R8 other end connect photoelectrical coupler OC1 light emitting diode
Anode, photoelectrical coupler OC1 light-emitting diodes tube cathode connection switch pipe T2 drain electrode, photoelectrical coupler OC1 transistor collector are made
For the feedback output end of the signal control module, photoelectrical coupler OC1 transistor emitter connection ground, 2 source electrode of switch transistor T connects
It connects with reference to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920282796.2U CN209559340U (en) | 2019-03-06 | 2019-03-06 | A kind of temperature protection and alarm circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920282796.2U CN209559340U (en) | 2019-03-06 | 2019-03-06 | A kind of temperature protection and alarm circuit |
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| Publication Number | Publication Date |
|---|---|
| CN209559340U true CN209559340U (en) | 2019-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920282796.2U Active CN209559340U (en) | 2019-03-06 | 2019-03-06 | A kind of temperature protection and alarm circuit |
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| CN (1) | CN209559340U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177757A (en) * | 2020-09-18 | 2021-01-05 | 广州联优科技有限公司 | Protection device of ship engine |
| CN113507772A (en) * | 2021-08-16 | 2021-10-15 | 欧普照明股份有限公司 | Hysteresis circuit, emergency lighting circuit and lighting equipment |
-
2019
- 2019-03-06 CN CN201920282796.2U patent/CN209559340U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177757A (en) * | 2020-09-18 | 2021-01-05 | 广州联优科技有限公司 | Protection device of ship engine |
| CN113507772A (en) * | 2021-08-16 | 2021-10-15 | 欧普照明股份有限公司 | Hysteresis circuit, emergency lighting circuit and lighting equipment |
| WO2023020331A1 (en) * | 2021-08-16 | 2023-02-23 | 欧普照明股份有限公司 | Hysteresis circuit, emergency lighting circuit, and lighting device |
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